I stupidly thought I knew what I was doing.

When filling from the bottom car was off, once oil started to trickle over I replaced drain bolt lowered car, started it up, let it idle for a bit then started through the gears, first fill triggered trans failsafe program, which I expected it to do because there would have been next to no oil in the transmission. Switched it off then repeated fill until it trickled over, then repeated again with switching on and going through the gears. Third fill and it didn't want to take anymore. Did the gears again with engine on, then checked oil level by removing plug, it came running out, so replaced plug assuming that it was full.

After all this when driving it, it then started to behave erratic- different from before oil was changed.

After reading on here about other people having transmission issues and performing a reset I thought it was what it needed.

Any thoughts on a way forward?